Maximum Total Field Bus Length (For Field Bus Module Communication) - ABB Symphony Harmony Series Instructions Manual

Maximum Field Bus Length
M A X IM U M
D IS TA N C E
M E TE R S (FE E T )
Figure 2-6. Maximum Total Field Bus Length (for Field Bus Module Communication)
Example
WBPEEUI260045A0
All field wiring to the field bus termination unit must comply
with the following.
1. The total length of field bus wire for a given number of
transmitters must not exceed the length specified in
Figure 2-6 for termination unit to transmitter communication.
Figure 2-7 applies to smart transmitter terminal to transmitter
communication when the Type STT02 Smart Transmitter Ter-
minal is connected to the termination unit.
1 20 0
(4 00 0)
9 00
(2 95 2)
6 00
(1 96 8)
3 00
(1 00 0)
1 2 3 4
2. Virtually any combination of field bus type/transmitter can
be used as long as the requirements in Step 1 are met.
If there are five transmitters connected to the NTFB01 termi-
nation unit on a star field bus, the total maximum length of
the field bus is 1200 meters. The wire for each of the five
transmitters can be any length provided the total length of
wire does not exceed 1200 meters. Thus two transmitters
could be 100 meters from the termination unit, two could be
250 meters from the termination unit, and the last transmitter
500 meters from the termination unit.
2(100 meters) + 2(250 meters) + 500 meters = 1200 meters maximum
5 6 7 8 9 10
N U M B E R O F TR A N S M IT TE R S
Setup/Physical Installation
T W O C H A N N E L S
O N E C H A N N E L
11 1 2 1 3 1 4 1 5
T 0 3 99 0 A
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